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Replace the username/password stub with Balinyaar's real credential (phone-OTP) and add the role router every authenticated screen sits behind. - services/auth rewritten for OTP over the b2 contract: types/keys/constants, clientApi+mockApi behind a config'd seam, hooks (useRequestOtp/useVerifyOtp/ useMe/useRefresh/useLogout/useSelectRole/useSessionRoleSync). Stub removed. - A1/A2 customer login + B1/B2 nurse switch as one OTP flow at /login (PhoneStep/OtpStep: auto-verify, resend countdown, wrong/expired/lockout states). - Role router: pure resolveRoleDestination + RoleRouter -> family / nurse / admin / select-role, with a splash while /me loads (no wrong-shell flash). - SelectRole first-use screen at /select-role. - Widened AuthState (roles via SessionUser), hydrated from /me by useSessionRoleSync. - Fetch-layer silent token refresh (single-flight + one retry) + shared persistAuthTokens/clearAuthTokens; useRefresh as the on-demand path. - auth i18n namespace in both locales; tests for routing branches, countdown, OtpStep state machine, RoleRouter branches; fixed jest @/ -> src alias. - Docs: client/CLAUDE.md, frontend STATUS/report, for-backend REQ-002..004. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>